#!/bin/sh
#
#
# OCF resource agent to attach a cinder volume to an instance.
#
# Copyright (c) 2018 Mathieu GRZYBEK
# Based on code of Markus Guertler
# All Rights Reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of version 2 of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# Further, this software is distributed without any warranty that it is
# free of the rightful claim of any third person regarding infringement
# or the like.  Any license provided herein, whether implied or
# otherwise, applies only to this software file.  Patent licenses, if
# any, provided herein do not apply to combinations of this program with
# other software, or any other product whatsoever.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
#


#######################################################################
# Initialization:

: ${OCF_FUNCTIONS_DIR=${OCF_ROOT}/lib/heartbeat}
. ${OCF_FUNCTIONS_DIR}/ocf-shellfuncs

. ${OCF_FUNCTIONS_DIR}/openstack-common.sh

# Defaults
OCF_RESKEY_volume_local_check_default="true"

: ${OCF_RESKEY_volume_local_check=${OCF_RESKEY_volume_local_check_default}}

#######################################################################


USAGE="usage: $0 {start|stop|status|meta-data}";
###############################################################################


###############################################################################
#
# Functions
#
###############################################################################


metadata() {
cat <<END
<?xml version="1.0"?>
<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
<resource-agent name="openstack-cinder-volume" version="2.0">
<version>1.0</version>
<longdesc lang="en">
Resource Agent to attach a cinder volume to an instance.
It relies on attributes given by openstack-info resource agent (openstack_id attribute).
</longdesc>
<shortdesc lang="en">Attach a cinder volume</shortdesc>

<parameters>
END

common_meta_data

cat <<END
<parameter name="volume_local_check">
<longdesc lang="en">
This option allows the cluster to monitor the cinder volume presence without 
calling the API.
</longdesc>
<shortdesc lang="en">Monitor cinder volume locally</shortdesc>
<content type="boolean" default="${OCF_RESKEY_volume_local_check_default}" />
</parameter>

<parameter name="volume_id" required="1">
<longdesc lang="en">
Cinder volume identifier to use to attach the block storage.
</longdesc>
<shortdesc lang="en">Volume ID</shortdesc>
<content type="string" />
</parameter>
</parameters>

<actions>
<action name="start" timeout="180s" />
<action name="stop" timeout="180s" />
<action name="monitor" depth="0" timeout="180s" interval="60s" />
<action name="validate-all" timeout="5s" />
<action name="meta-data" timeout="5s" />
</actions>
</resource-agent>
END
}

_get_node_id() {
	node_id=$(${HA_SBIN_DIR}/attrd_updater --query -n openstack_id -N $(crm_node -n) |
		awk -F= '{gsub("\"","");print $NF}')

	if ! echo $node_id|grep -P "^[0-9a-f]{8}-([0-9a-f]{4}-){3}[0-9a-f]{12}$"; then
		ocf_exit_reason "openstack_id attribute must be set for node $crm_node"
		exit $OCF_ERR_CONFIGURED
	fi
}

osvol_validate() {
	local result

	check_binary "$OCF_RESKEY_openstackcli"
	
	get_config

	result=$(run_openstackcli "volume list")
	if ! echo "$result" | grep -q $OCF_RESKEY_volume_id; then
		ocf_exit_reason "volume-id $OCF_RESKEY_volume_id not found"
		return $OCF_ERR_CONFIGURED
	fi

	${HA_SBIN_DIR}/attrd_updater --query -n openstack_id -N $(crm_node -n) > /dev/null 2>&1
	if [ $? -ne 0 ] ; then
		ocf_log warn "attr_updater failed to get openstack_id attribute of node $OCF_RESOURCE_INSTANCE"
		return $OCF_ERR_GENERIC
	fi

	return $OCF_SUCCESS
}

osvol_monitor() {
	local result
	local node_id
	local short_volume_id

	node_id=$(_get_node_id)

	if [ "$__OCF_ACTION" = "monitor" ] && ocf_is_true $OCF_RESKEY_volume_local_check ; then
		#
		# Is the volue attached?
		# We check the local devices
		#
		short_volume_id=$(echo $OCF_RESKEY_volume_id | awk '{print substr($0, 0, 20)}')
		if lsblk /dev/disk/by-id/virtio-$short_volume_id 1>/dev/null 2>&1; then
			return $OCF_SUCCESS
		else
			ocf_log warn "$OCF_RESKEY_volume_id is not attached to instance $node_id"
			return $OCF_NOT_RUNNING
		fi
	fi

	#
	# Is the volue attached?
	# We use the API
	#
	result=$(run_openstackcli "volume show \
		--column status \
		--column attachments \
		--format value \
		$OCF_RESKEY_volume_id")

	if echo "$result" | grep -q available; then
		ocf_log warn "$OCF_RESKEY_volume_id is not attached to any instance"
		return $OCF_NOT_RUNNING
	else
		export attached_server_id=$(echo "$result"|head -n1|
			grep -P -o "'server_id': '[0-9a-f]{8}-([0-9a-f]{4}-){3}[0-9a-f]{12}'"|
			grep -P -o "[0-9a-f]{8}-([0-9a-f]{4}-){3}[0-9a-f]{12}")
		ocf_log info "$OCF_RESKEY_volume_id is attached to instance $attached_server_id"

		# Compare node_id and the id of the node the volume is attached to

		if [ "$node_id" != "$attached_server_id" ] ; then
			ocf_log warn "$OCF_RESKEY_volume_id is not attached to this instance"
			return $OCF_NOT_RUNNING
		fi
	fi

	return $OCF_SUCCESS
}

osvol_stop() {
	local node_id

	#
	# Is the volume already attached?
	#
	osvol_monitor
	if [ $? = $OCF_NOT_RUNNING ]; then
		ocf_log info "Volume $OCF_RESKEY_volume_id already available"
		return $OCF_SUCCESS
	fi

	node_id=$(_get_node_id)

	#
	# Detach the volume
	#
	if ! run_openstackcli "server remove volume $node_id $OCF_RESKEY_volume_id"; then
		ocf_log error "Couldn't remove volume $OCF_RESKEY_volume_id from instance $node_id"
		return $OCF_ERR_GENERIC
	fi

	ocf_log info "Successfully removed $OCF_RESKEY_volume_id from instance $node_id"
	return $OCF_SUCCESS
}

osvol_start() {
	local node_id

	#
	# Is the volume already attached?
	#
	osvol_monitor
	if [ $? = $OCF_SUCCESS ]; then
		ocf_log info "$OCF_RESKEY_volume_id already attached"
		return $OCF_SUCCESS
	fi

	#
	# Detach it from another node
	# TODO: make it optional in case multi-attachment is allowed by Cinder
	#
	if [ ! -z $attached_server_id ] ; then
		if ! run_openstackcli "server remove volume $attached_server_id $OCF_RESKEY_volume_id"; then
			ocf_log error "Couldn't remove volume $OCF_RESKEY_volume_id from instance $attached_server_id"
			return $OCF_ERR_GENERIC
		fi
	fi

	export attached_server_id=""
	
	node_id=$(_get_node_id)

	#
	# Attach the volume
	#
	run_openstackcli "server add volume $node_id $OCF_RESKEY_volume_id"
	if [ $? != $OCF_SUCCESS ]; then
		ocf_log error "Couldn't add volume $OCF_RESKEY_volume_id to instance $node_id"
		return $OCF_ERR_GENERIC
	fi

	return $OCF_SUCCESS
}

###############################################################################
#
# MAIN
#
###############################################################################

case $__OCF_ACTION in
	meta-data)
		metadata
		exit $OCF_SUCCESS
		;;
	usage|help)
		echo $USAGE
		exit $OCF_SUCCESS
		;;
esac

if ! ocf_is_root; then
	ocf_log err "You must be root for $__OCF_ACTION operation."
	exit $OCF_ERR_PERM
fi

case $__OCF_ACTION in
	start)
		osvol_validate || exit $?
		osvol_start;;
	stop)
		osvol_validate || exit $?
		osvol_stop;;
	monitor|status)
		osvol_validate || exit $?
		osvol_monitor;;
	validate-all)
		osvol_validate
		;;
	*)
		echo $USAGE
		exit $OCF_ERR_UNIMPLEMENTED
		;;
esac

exit $?
